linux-kernel - Re: [PATCH 1/3] tools include: Add uapi mman.h for each architecture

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Date:   Wed, 14 Sep 2016 18:23:32 +0800
From:   "Wangnan (F)" <wangnan0@...wei.com>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
CC:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        <linux-kernel@...r.kernel.org>, <lizefan@...wei.com>,
        <pi3orama@....com>
Subject: Re: [PATCH 1/3] tools include: Add uapi mman.h for each architecture



On 2016/9/14 18:00, Naveen N. Rao wrote:
> On 2016/09/14 05:36PM, Wang Nan wrote:
>>
>> On 2016/9/14 17:28, Naveen N. Rao wrote:
>>> On 2016/09/12 06:15PM, Arnaldo Carvalho de Melo wrote:
>>>> Em Mon, Sep 12, 2016 at 04:07:42PM -0300, Arnaldo Carvalho de Melo escreveu:
>>>>> Em Mon, Sep 12, 2016 at 12:54:29PM +0000, Wang Nan escreveu:
>>>>>> Some mmap related macros have different values for different
>>>>>> architectures. This patch introduces uapi mman.h for each
>>>>>> architectures.
>>>>>>
>>>>>> Three headers are cloned from kernel include to tools/include:
>>>>>>
>>>>>>    tools/include/uapi/asm-generic/mman-common.h
>>>>>>    tools/include/uapi/asm-generic/mman.h
>>>>>>    tools/include/uapi/linux/mman.h
>>>>> Cool, the above was done as copies, why not the rest? IIRC you mentioned
>>>>> some reasoning behind that decision, but we need it spelled out here.
>>>>>
>>>>> For instance, I went on and look at arch/xtensa/include/uapi/asm/mman.h,
>>>>> and couldn't find why we shouldn't copy it just like the three files
>>>>> above.
>>>>>
>>>>> I'm looking now at why the build breaks in so many systems, first hunch
>>>>> is that bits/ part (the ones without the failure details probably have
>>>>> the same errors), alpine uses musl libc, but some that broke are glibc
>>>>> based.
>>>> So, please take a look at my perf/core branch, I applied 1/3 and 3/3,
>>>> but took a different path for 2/3, now it builds for all systems I have
>>>> containers for:
>>> This still fails for me on ppc64. Perhaps we should guard
>>> P_MMAP_FLAG(32BIT) and potentially others with a #ifdef, which was
>>> earlier reverted by commit 256763b0 ("perf trace beauty mmap: Add more
>>> conditional defines")?
>> Perhaps we should set all non-exist flag to 0 in each uapi mman.h?
> Will that work for MADV_* since the macro there is for a case statement?

Then fall back to include/uapi/asm-generic/mman-common.h. And I
realized the missing of MADV_FEEE in tools/perf/trace/beauty/mmap.c.
Is that intentionally?

Thank you.